By shop you mean the real-life, in-game store? Or those Merchants in the game?
If you're talking about the in-game store, you don't need to buy the "skill unlock packs" as you say you have all campaigns and the expansion. You can unlock skills on your account through skill quests, purchase through gold coins and hero skill points, as well as Balthazar points, etc.
The Skill Unlock Packs are there for those who are interested in the PVP side and would like the option to have all skills unlocked right away. They also make the skills (elites and non-elites) available for use on your heroes, whether in PVE or PVE.
So no, there aren't any new skills in those Unlock Packs, just the option to make them all available. No need to really buy them, just look at the skills (you don't really need all skills unlocked right away, do you?) you need and unlock them through PVE or PVP.
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